WO2021241498A1 - Vehicular display device - Google Patents

Vehicular display device Download PDF

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Publication number
WO2021241498A1
WO2021241498A1 PCT/JP2021/019601 JP2021019601W WO2021241498A1 WO 2021241498 A1 WO2021241498 A1 WO 2021241498A1 JP 2021019601 W JP2021019601 W JP 2021019601W WO 2021241498 A1 WO2021241498 A1 WO 2021241498A1
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WIPO (PCT)
Prior art keywords
polarizing plate
grid polarizing
wire grid
infrared light
vehicle
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PCT/JP2021/019601
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French (fr)
Japanese (ja)
Inventor
彰大 後藤
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日本精機株式会社
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Publication of WO2021241498A1 publication Critical patent/WO2021241498A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Arrangement of adaptations of instruments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/24—Housings ; Casings for instruments
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/24—Housings ; Casings for instruments
    • G01D11/26—Windows; Cover glasses; Sealings therefor
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements

Definitions

  • the present invention relates to a vehicle display device mounted on a vehicle such as an automobile or a motorcycle.
  • Patent Document 1 As a vehicle display device mounted on a vehicle such as an automobile or a motorcycle, as described in Patent Document 1, a visual image (driver) who sits in the driver's seat of the vehicle and visually recognizes the liquid crystal display panel is imaged.
  • the infrared light emitted from the infrared irradiation unit irradiates the viewer's face, and the infrared light reflected on the viewer's face is used as an imaging means (in the near infrared region).
  • the viewer is imaged by incident on a camera having sensitivity). From the captured image of the viewer, for example, whether or not the viewer is drowsy by detecting the eyes of the viewer, whether or not the viewer is driving aside, etc. You can judge.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle display device capable of preventing a situation in which the image pickup of a viewer is obstructed by strong reflected light.
  • the vehicle display device has a display means for displaying information about a vehicle and infrared light irradiation for irradiating the display means toward a visible viewer.
  • a means and an image pickup means for imaging the viewer with the infrared light are provided, a first wire grid polarizing plate is provided on the side of the viewer of the image pickup means, and the infrared light irradiation means is visually recognized.
  • a second wire grid polarizing plate is provided on the side of the person, and the polarization direction of the first wire grid polarizing plate and the polarization direction of the second wire grid polarizing plate are orthogonal to each other.
  • the display means is a liquid crystal display panel, and a retardation plate is provided on the side of the display means and the viewer of the image pickup means, and the phase-advancing axis or the slow-phase axis of the retardation plate is the first wire grid. It may be parallel to the polarization direction of the polarizing plate.
  • a protective member made of a material that does not affect the polarization characteristics of the infrared light may be provided on the side of the display means, the infrared light irradiation means, and the viewer of the image pickup means.
  • the protective member is preferably made of inorganic glass or cast material.
  • the vehicle display device According to the vehicle display device according to the present invention, it is possible to prevent a situation in which the image pickup of the viewer is obstructed by strong reflected light.
  • FIG. 3 is a cross-sectional view taken along the line AA of the vehicle instrument of FIG. It is explanatory drawing which shows the arrangement relation of the retardation film of the vehicle instrument of FIG. 1 and a wire grid polarizing plate. It is explanatory drawing which shows the path of the infrared light at the time of image pickup by the vehicle instrument of FIG.
  • the vehicle instrument 1 includes a case 2, a display panel 3 housed in the case 2, a backlight 4 and a camera 5 provided on the back side of the display panel 3, and left and right sides of the case 2.
  • Two LEDs are provided in each, a cover glass 7 that covers the case 2 from the front side, a retardation film 8 as a retardation plate provided on the front side of the display panel 3, and a retardation film 8 provided on the front side of the camera 5.
  • the wire grid polarizing plate 9 as the first polarizing plate and the wire grid polarizing plate 10 as the second polarizing plate provided on the front side of each LED 6 are provided.
  • Case 2 is a box-shaped, resin-made instrument housing with an open front side, and has a bottom wall portion 2a and a peripheral wall portion 2b.
  • the display panel 3 is a TFT (thin film transistor) type liquid crystal display panel, and displays various information about the vehicle such as vehicle speed, shift indicator, mileage, remaining fuel (remaining charge amount), outside air temperature, and direction of travel by navigation. indicate.
  • the display panel 3 is provided with an infrared light transmitting portion 3a in which an image is not displayed and visible light is reflected or absorbed to transmit infrared light.
  • the backlight 4 has, for example, a diffusion sheet, a prism sheet, a visible light source capable of supplying visible light to these sheets, and the like, and illuminates the display panel 3 substantially uniformly from the back side.
  • the backlight 4 is provided with a hole 4a, and the camera 5 is arranged at the position of the hole 4a.
  • the camera 5 is provided on the bottom wall portion 2a of the case 2, is located on the back surface side of the infrared light transmitting portion 3a of the display panel 3 so as to face the infrared light transmitting portion 3a, and is irradiated from the LED 6 described later.
  • An image pickup device having sensitivity to infrared light in a certain wavelength band and a lens capable of transmitting infrared light to form an image on the image pickup device are provided, and a near-infrared image of driver D (see FIG. 4) is captured.
  • a total of four LEDs 6 are provided on the peripheral wall portion 2b of the case 2 and are infrared light irradiation means for irradiating the driver D with infrared light (near infrared rays).
  • the cover glass 7 is attached to the front side of the peripheral wall portion 2b of the case 2, covers the display panel 3, the camera 5, the LED 6, the wire grid polarizing plate 9 and the wire grid polarizing plate 10, and protects them from dust and the like.
  • the cover glass 7 is made of a material that does not affect the polarization characteristics of the infrared light emitted by the LED 6, for example, inorganic glass or a cast material of a resin such as acrylic or polycarbonate, and is a transmissive portion that transmits visible light and infrared light.
  • a black non-transmissive portion 7b that is provided around the transmissive portion 7a and abuts on the peripheral wall portion 2b and does not transmit light, and an infrared light transmission that transmits infrared light at the front side portion of the four LEDs 6. It has a portion 7c.
  • the retardation film 8 is made of a retardation film (SRF film), and is provided between the retardation film (SRF film) and the display panel 3 on the back surface side of the transmission portion 7a of the cover glass 7.
  • the retardation film 8 slows the film passing speed of either the P wave or the S wave to change the linearly polarized light to circularly polarized light, thereby eliminating rainbow unevenness in the liquid crystal display and improving the brightness, and also by the driver. It solves the problem that the liquid crystal display disappears when D wears polarized sunglasses.
  • the wire grid polarizing plate 9 is provided between the camera 5 and the display panel 3, and the wire grid polarizing plate 10 is provided between the LED 6 and the cover glass 7. Both the wire grid polarizing plate 9 and the wire grid polarizing plate 10 transmit only polarized light vibrating in a specific direction, and the polarization direction of the wire grid polarizing plate 9 (the vibration direction of the polarized light transmitted by the wire grid polarizing plate). And the polarization direction of the wire grid polarizing plate 10 are arranged so as to be orthogonal to each other.
  • phase advance axis or the slow phase axis of the retardation film 8 is parallel to the polarization direction of the wire grid polarizing plate 9 and / or the polarization direction of the wire grid polarizing plate 10, and as shown in FIG. 3, the retardation film
  • the phase-advancing axis of 8 is the width direction of the vehicle (horizontal direction in FIG. 3) and the slow-phase axis is the height direction of the vehicle (vertical direction in FIG. 3)
  • the polarization direction of the wire grid polarizing plate 9 is the vehicle.
  • the wire grid polarizing plate 10 When installed so as to be in the width direction of, the wire grid polarizing plate 10 becomes parallel to the phase advance axis of the retardation film 8, and the wire grid polarizing plate 10 is installed so that the polarization direction is in the height direction of the vehicle. It becomes parallel to the slow axis of the phase difference film 8.
  • the backlight 4 is turned on to display various information on the display panel 3, and the LED 6 is turned on to irradiate infrared light.
  • the LED 6 is turned on to irradiate infrared light.
  • FIG. 4 only the P wave of the infrared light from the LED 6 passes through the wire grid polarizing plate 10 and is emitted from the infrared light transmitting portion 7c of the cover glass 7 to the outside of the vehicle instrument 1 for operation. Reach the face of person D.
  • the strongly reflected light (normally reflected light) by the glasses G returns to the vehicle instrument 1 as a P wave, and the transmission portion 7a of the cover glass 7, the retardation film 8 and the display panel. It passes through the infrared light transmitting portion 3a of 3 and heads toward the camera 5 (because the polarization direction of the P wave transmitted through the wire grid polarizing plate 10 is parallel to the phase-advancing axis or the slow-phase axis of the retardation film 8). , Passing through the retardation film 8 with linearly polarized light.) Since the wire grid polarizing plate 9 transmits only the S wave and cuts the P wave, strong reflected light is not incident on the camera 5.
  • the reflected light diffusely reflected by the driver D's eyes and other facial parts instead of the glasses G is divided into P waves and S waves and returned to the vehicle instrument 1, so that the S waves press the wire grid polarizing plate 9.
  • the face of the driver D is imaged by the camera 5 through transmission.
  • the captured image of the driver D is input to the control unit (not shown), and the state of the driver D is detected from the movement of the face and the like.
  • the control unit detects where the driver D is looking from the position of the eyes of the driver D, that is, the viewpoint position of the driver D, and the display panel 3 is adjusted to the viewpoint position.
  • the display can be controlled, and if the driver D is drowsy or inattentive driving, a warning can be issued by sound, display, vibration, or the like.
  • the vehicle instrument 1 is operated by a display panel 3 for displaying information about the vehicle, an LED 6 for irradiating the display panel 3 with infrared light toward a visible driver D, and infrared light.
  • a camera 5 for photographing the person D is provided, a wire grid polarizing plate 10 is provided on the side of the driver D of the LED 6, and a wire grid polarizing plate 9 is provided on the side of the driver D of the camera 5, and the wire grid polarizing plate is provided.
  • the polarization direction of the plate 9 and the polarization direction of the wire grid polarizing plate 10 are orthogonal to each other, the infrared light emitted from the LED 6 is linearly polarized by the wire grid polarizing plate 10 on the front side of the LED 6, and the driver D's Even if the wire grid polarizing plate 9 on the front side of the camera 5 is positively reflected by the glasses G or the like and returned as strongly reflected light, the polarization direction of the wire grid polarizing plate 9 is orthogonal to the polarization direction of the wire grid polarizing plate 10, and the strongly reflected light thereof. To cut.
  • a part of the reflected light diffusely reflected by the driver D passes through the wire grid polarizing plate 9 and is incident on the camera 5, so that the situation where the image pickup of the driver D is hindered by the strong reflected light is prevented. be able to.
  • the polarization direction of the wire grid polarizing plate 9 (and the polarization direction of the wire grid polarizing plate 10 orthogonal to the polarization direction) forms an angle that diagonally intersects the phase-advancing axis or the slow-phase axis of the retardation film 8.
  • the infrared light polarized by the wire grid polarizing plate 9 passes through the retardation film 8, it returns to circularly polarized light, irradiates the driver D with the P wave, and the S wave cannot enter the camera 5.
  • the phase-advancing axis or the slow-phase axis of the retardation film 8 is parallel to the polarization direction of the wire grid polarizing plate 9, the performance of the wire grid polarizing plate and the retardation film is not impaired. , Both can be mounted on the vehicle instrument 1 at the same time.
  • the cover glass 7 is made of an inorganic glass or a cast material that does not affect the polarization characteristics of infrared light, it is possible to install the cover glass without impairing the performance of the wire grid polarizing plate. It will be possible.
  • the retardation film 8 is not provided on the front side of the LED 6, and the camera 5 is provided on the back side of the display panel 3, but the retardation film 8 is provided on the front side of the LED 6.
  • the camera 5 may not be provided on the back side of the display panel 3, and the arrangement of each component of the vehicle display device is such that the arrangement of the wire grid polarizing plate is suitable for the gist of the present invention. It doesn't matter what it is.
  • the phase-advancing axis of the retardation film 8 is in the width direction of the vehicle, and the slow-phase axis of the retardation film 8 is in the height direction of the vehicle.
  • the axis may be the width direction of the vehicle, and the phase advance axis may be the height direction of the vehicle.
  • Vehicle instrument vehicle display device
  • Display panel display means, liquid crystal display panel
  • Camera imaging means
  • Infrared light irradiation means LED
  • Cover glass protecting member
  • Phase difference film phase difference plate
  • Wire grid polarizing plate first wire grid polarizing plate
  • Wire grid polarizing plate second wire grid polarizing plate
  • D Driver visual person

Abstract

Provided is a vehicular display device with which it is possible to prevent situations in which an image of the viewer is hindered by intense reflected light. A vehicular gauge 1 comprises a display panel 3 that displays information pertaining to the vehicle, LEDs 6 that shine infrared light toward a driver D to whom the display panel 3 is visible, and a camera 5 that captures an image of the driver D using infrared light, a wire-grid polarizing plate 9 being provided to the driver D-side of the camera 5, wire-grid polarizing plates 10 being provided to the driver D-sides of the LEDs 6, and the polarization direction of the wire-grid polarizing plate 9 and the polarization direction of the wire-grid polarizing plates 10 being orthogonal.

Description

車両用表示装置Display device for vehicles
　本発明は、自動車や自動二輪車等の車両に搭載される車両用表示装置に関する。  The present invention relates to a vehicle display device mounted on a vehicle such as an automobile or a motorcycle. The
　自動車や自動二輪車等の車両に搭載される車両用表示装置として、特許文献１に記載のように、車両の運転席に着座して液晶表示パネルを視認する視認者（運転者）を撮像し、その撮像画像から視認者の状態（挙動）を検知するカメラモジュールが搭載された車両用計器が知られている。 As a vehicle display device mounted on a vehicle such as an automobile or a motorcycle, as described in Patent Document 1, a visual image (driver) who sits in the driver's seat of the vehicle and visually recognizes the liquid crystal display panel is imaged. A vehicle instrument equipped with a camera module that detects the state (behavior) of a viewer from the captured image is known.
　特許文献１に記載の車両用計器では、赤外線照射部から照射される赤外光が視認者の顔に照射され、視認者の顔に反射された赤外光が撮像手段（近赤外領域に感度を持つカメラ）に入射して、視認者が撮像される。視認者の撮像画像からは、例えば視認者の目を検出して、視認者が眠気を催している状態であるか否か、視認者が脇見運転をしている状態であるか否か等を判断することができる。 In the vehicle instrument described in Patent Document 1, the infrared light emitted from the infrared irradiation unit irradiates the viewer's face, and the infrared light reflected on the viewer's face is used as an imaging means (in the near infrared region). The viewer is imaged by incident on a camera having sensitivity). From the captured image of the viewer, for example, whether or not the viewer is drowsy by detecting the eyes of the viewer, whether or not the viewer is driving aside, etc. You can judge.
特開２０２０－３２８２５号公報Japanese Unexamined Patent Publication No. 2020-32825
　ところで、従来の車両用表示装置では、視認者がメガネやサングラスをかけていて、赤外光がメガネやサングラスに反射されて撮像手段が強い反射光を拾うと、視認者の目を撮像して検出することができなくなるという問題がある。 By the way, in the conventional display device for vehicles, when the viewer wears glasses or sunglasses and the infrared light is reflected by the glasses or sunglasses and the imaging means picks up the strongly reflected light, the eyes of the viewer are imaged. There is a problem that it cannot be detected.
　本発明は、上記の事情に鑑みてなされたもので、視認者の撮像が強い反射光により妨げられる事態を防止することができる車両用表示装置を提供することを課題としている。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle display device capable of preventing a situation in which the image pickup of a viewer is obstructed by strong reflected light.
　上記課題を解決するために、本発明に係る車両用表示装置は、車両に関する情報を表示する表示手段と、前記表示手段を視認可能な視認者に向けて赤外光を照射する赤外光照射手段と、前記赤外光により前記視認者を撮像する撮像手段とを備え、前記撮像手段の前記視認者の側に第一のワイヤーグリッド偏光板が設けられるとともに前記赤外光照射手段の前記視認者の側に第二のワイヤーグリッド偏光板が設けられ、前記第一のワイヤーグリッド偏光板の偏光方向と前記第二のワイヤーグリッド偏光板の偏光方向とが直交することを特徴とする。 In order to solve the above problems, the vehicle display device according to the present invention has a display means for displaying information about a vehicle and infrared light irradiation for irradiating the display means toward a visible viewer. A means and an image pickup means for imaging the viewer with the infrared light are provided, a first wire grid polarizing plate is provided on the side of the viewer of the image pickup means, and the infrared light irradiation means is visually recognized. A second wire grid polarizing plate is provided on the side of the person, and the polarization direction of the first wire grid polarizing plate and the polarization direction of the second wire grid polarizing plate are orthogonal to each other.
　前記表示手段は液晶表示パネルで、前記表示手段及び前記撮像手段の前記視認者の側に位相差板が設けられ、前記位相差板の進相軸又は遅相軸が、前記第一のワイヤーグリッド偏光板の偏光方向と平行であってもよい。 The display means is a liquid crystal display panel, and a retardation plate is provided on the side of the display means and the viewer of the image pickup means, and the phase-advancing axis or the slow-phase axis of the retardation plate is the first wire grid. It may be parallel to the polarization direction of the polarizing plate.
　また、前記表示手段、前記赤外光照射手段及び前記撮像手段の前記視認者の側に、前記赤外光の偏光特性に影響しない材質からなる保護部材が設けられていてもよく、このとき、保護部材は、無機ガラス又はキャスト材からなることが望ましい。 Further, a protective member made of a material that does not affect the polarization characteristics of the infrared light may be provided on the side of the display means, the infrared light irradiation means, and the viewer of the image pickup means. The protective member is preferably made of inorganic glass or cast material.
　本発明に係る車両用表示装置によれば、視認者の撮像が強い反射光により妨げられる事態を防止することができる。  According to the vehicle display device according to the present invention, it is possible to prevent a situation in which the image pickup of the viewer is obstructed by strong reflected light. The
発明を実施するための形態に係る車両用計器を示す説明図である。It is explanatory drawing which shows the instrument for a vehicle which concerns on embodiment for carrying out an invention. 図１の車両用計器のＡ－Ａ線に沿った断面図である。FIG. 3 is a cross-sectional view taken along the line AA of the vehicle instrument of FIG. 図１の車両用計器の位相差フィルムとワイヤーグリッド偏光板の配置関係を示す説明図である。It is explanatory drawing which shows the arrangement relation of the retardation film of the vehicle instrument of FIG. 1 and a wire grid polarizing plate. 図１の車両用計器による撮像時の赤外光の経路を示す説明図である。It is explanatory drawing which shows the path of the infrared light at the time of image pickup by the vehicle instrument of FIG.
　本発明を実施するための形態について、図面に基づいて説明する。以下の説明では、車両用表示装置を自動車の運転席前方に搭載される車両用計器（ドライバーモニタリングシステム搭載メータ）に適用した場合を例に挙げ、車両用計器を視認する視認者（運転者）の側を正面側、その反対側を背面側とする。 The embodiment for carrying out the present invention will be described with reference to the drawings. In the following explanation, a case where a vehicle display device is applied to a vehicle instrument (meter equipped with a driver monitoring system) mounted in front of the driver's seat of an automobile is taken as an example, and a viewer (driver) who visually recognizes the vehicle instrument. The front side is the front side, and the opposite side is the back side.
　図１及び図２において、車両用計器１は、ケース２と、ケース２に収容された表示パネル３と、表示パネル３の背面側に設けられたバックライト４及びカメラ５と、ケース２の左右に２つずつ設けられたＬＥＤ６と、ケース２を正面側から覆うカバーガラス７と、表示パネル３の正面側に設けられた位相差板としての位相差フィルム８と、カメラ５の正面側に設けられた第一偏光板としてのワイヤーグリッド偏光板９と、各ＬＥＤ６の正面側に設けられた第二偏光板としてのワイヤーグリッド偏光板１０とを備える。 In FIGS. 1 and 2, the vehicle instrument 1 includes a case 2, a display panel 3 housed in the case 2, a backlight 4 and a camera 5 provided on the back side of the display panel 3, and left and right sides of the case 2. Two LEDs are provided in each, a cover glass 7 that covers the case 2 from the front side, a retardation film 8 as a retardation plate provided on the front side of the display panel 3, and a retardation film 8 provided on the front side of the camera 5. The wire grid polarizing plate 9 as the first polarizing plate and the wire grid polarizing plate 10 as the second polarizing plate provided on the front side of each LED 6 are provided.
　ケース２は、正面側が開口した箱型で樹脂製の計器ハウジングであり、底壁部２ａ及び周壁部２ｂを有する。  Case 2 is a box-shaped, resin-made instrument housing with an open front side, and has a bottom wall portion 2a and a peripheral wall portion 2b. The
　表示パネル３は、ＴＦＴ（薄膜トランジスタ）型の液晶表示パネルであり、車速やシフトインジケータ、走行距離、残燃料（残充電量）、外気温、ナビゲーションによる進行方向の指示等の車両に関する各種の情報を表示する。表示パネル３には、画像が表示されず、且つ、可視光を反射又は吸収して赤外光を透過させる赤外光透過部３ａが設けられている。 The display panel 3 is a TFT (thin film transistor) type liquid crystal display panel, and displays various information about the vehicle such as vehicle speed, shift indicator, mileage, remaining fuel (remaining charge amount), outside air temperature, and direction of travel by navigation. indicate. The display panel 3 is provided with an infrared light transmitting portion 3a in which an image is not displayed and visible light is reflected or absorbed to transmit infrared light.
　バックライト４は、例えば拡散シートやプリズムシート、これらシートに可視光を供給可能な可視光源等を有し、表示パネル３を背面側から略均一に照明する。バックライト４には孔部４ａが設けられ、孔部４ａの位置にカメラ５が配置されている。 The backlight 4 has, for example, a diffusion sheet, a prism sheet, a visible light source capable of supplying visible light to these sheets, and the like, and illuminates the display panel 3 substantially uniformly from the back side. The backlight 4 is provided with a hole 4a, and the camera 5 is arranged at the position of the hole 4a.
　カメラ５は、ケース２の底壁部２ａに設けられて表示パネル３の赤外光透過部３ａの背面側に、赤外光透過部３ａと対峙するように位置し、後述のＬＥＤ６から照射される波長帯の赤外光に感度を持つ撮像素子、及び、赤外光を透過させて撮像素子に結像させ得るレンズを備え、運転者Ｄ（図４参照）の近赤外線画像を撮像する。 The camera 5 is provided on the bottom wall portion 2a of the case 2, is located on the back surface side of the infrared light transmitting portion 3a of the display panel 3 so as to face the infrared light transmitting portion 3a, and is irradiated from the LED 6 described later. An image pickup device having sensitivity to infrared light in a certain wavelength band and a lens capable of transmitting infrared light to form an image on the image pickup device are provided, and a near-infrared image of driver D (see FIG. 4) is captured.
　ＬＥＤ６は、ケース２の周壁部２ｂに計４つ設けられ、赤外光（近赤外線）を運転者Ｄに向けて照射する赤外光照射手段である。  A total of four LEDs 6 are provided on the peripheral wall portion 2b of the case 2 and are infrared light irradiation means for irradiating the driver D with infrared light (near infrared rays). The
　カバーガラス７は、ケース２の周壁部２ｂの正面側に取り付けられ、表示パネル３、カメラ５、ＬＥＤ６、ワイヤーグリッド偏光板９及びワイヤーグリッド偏光板１０を覆い、これらを塵埃等から保護する。カバーガラス７は、ＬＥＤ６が照射する赤外光の偏光特性に影響しない材質、例えば、無機ガラス、又は、アクリル、ポリカーボネート等の樹脂のキャスト材からなり、可視光及び赤外光を透過させる透過部７ａと、透過部７ａの周囲に設けられて周壁部２ｂに当接し、光を透過させない黒色の非透過部７ｂと、４つのＬＥＤ６の正面側の部分で赤外光を透過させる赤外光透過部７ｃとを有する。 The cover glass 7 is attached to the front side of the peripheral wall portion 2b of the case 2, covers the display panel 3, the camera 5, the LED 6, the wire grid polarizing plate 9 and the wire grid polarizing plate 10, and protects them from dust and the like. The cover glass 7 is made of a material that does not affect the polarization characteristics of the infrared light emitted by the LED 6, for example, inorganic glass or a cast material of a resin such as acrylic or polycarbonate, and is a transmissive portion that transmits visible light and infrared light. 7a, a black non-transmissive portion 7b that is provided around the transmissive portion 7a and abuts on the peripheral wall portion 2b and does not transmit light, and an infrared light transmission that transmits infrared light at the front side portion of the four LEDs 6. It has a portion 7c.
　位相差フィルム８は、リタデーションフィルム（ＳＲＦフィルム）からなり、カバーガラス７の透過部７ａの背面側で表示パネル３との間に設けられている。位相差フィルム８は、Ｐ波又はＳ波の何れか一方のフィルム通過速度を遅らせて直線偏光を円偏光に変えることにより、液晶表示の虹ムラの解消や輝度の向上に供し、また、運転者Ｄが偏光サングラスを着用した際に液晶表示が見えなくなる問題を解消する。 The retardation film 8 is made of a retardation film (SRF film), and is provided between the retardation film (SRF film) and the display panel 3 on the back surface side of the transmission portion 7a of the cover glass 7. The retardation film 8 slows the film passing speed of either the P wave or the S wave to change the linearly polarized light to circularly polarized light, thereby eliminating rainbow unevenness in the liquid crystal display and improving the brightness, and also by the driver. It solves the problem that the liquid crystal display disappears when D wears polarized sunglasses.
　ワイヤーグリッド偏光板９は、カメラ５と表示パネル３との間に設けられ、ワイヤーグリッド偏光板１０は、ＬＥＤ６とカバーガラス７との間に設けられている。ワイヤーグリッド偏光板９及びワイヤーグリッド偏光板１０は、何れも、特定方向に振動する偏光のみを透過させるもので、ワイヤーグリッド偏光板９の偏光方向（ワイヤーグリッド偏光板が透過させる偏光の振動方向）とワイヤーグリッド偏光板１０の偏光方向とが直交するように配置されている。 The wire grid polarizing plate 9 is provided between the camera 5 and the display panel 3, and the wire grid polarizing plate 10 is provided between the LED 6 and the cover glass 7. Both the wire grid polarizing plate 9 and the wire grid polarizing plate 10 transmit only polarized light vibrating in a specific direction, and the polarization direction of the wire grid polarizing plate 9 (the vibration direction of the polarized light transmitted by the wire grid polarizing plate). And the polarization direction of the wire grid polarizing plate 10 are arranged so as to be orthogonal to each other.
　また、位相差フィルム８の進相軸又は遅相軸は、ワイヤーグリッド偏光板９の偏光方向及び／又はワイヤーグリッド偏光板１０の偏光方向と平行であり、図３に示すように、位相差フィルム８の進相軸が車両の幅方向（図３の左右方向）で、遅相軸が車両の高さ方向（図３の上下方向）である場合、ワイヤーグリッド偏光板９は、偏光方向が車両の幅方向となるように設置されると、位相差フィルム８の進相軸と平行になり、ワイヤーグリッド偏光板１０は、偏光方向が車両の高さ方向となるように設置されると、位相差フィルム８の遅相軸と平行になる。 Further, the phase advance axis or the slow phase axis of the retardation film 8 is parallel to the polarization direction of the wire grid polarizing plate 9 and / or the polarization direction of the wire grid polarizing plate 10, and as shown in FIG. 3, the retardation film When the phase-advancing axis of 8 is the width direction of the vehicle (horizontal direction in FIG. 3) and the slow-phase axis is the height direction of the vehicle (vertical direction in FIG. 3), the polarization direction of the wire grid polarizing plate 9 is the vehicle. When installed so as to be in the width direction of, the wire grid polarizing plate 10 becomes parallel to the phase advance axis of the retardation film 8, and the wire grid polarizing plate 10 is installed so that the polarization direction is in the height direction of the vehicle. It becomes parallel to the slow axis of the phase difference film 8.
　車両用計器１では、車両のイグニッションがオンされると、バックライト４が点灯して表示パネル３に各種情報が表示されるとともに、ＬＥＤ６が点灯して赤外光が照射される。図４に示すように、ＬＥＤ６からの赤外光は、Ｐ波のみがワイヤーグリッド偏光板１０を透過してカバーガラス７の赤外光透過部７ｃから車両用計器１の外部に出射し、運転者Ｄの顔に到達する。 In the vehicle instrument 1, when the ignition of the vehicle is turned on, the backlight 4 is turned on to display various information on the display panel 3, and the LED 6 is turned on to irradiate infrared light. As shown in FIG. 4, only the P wave of the infrared light from the LED 6 passes through the wire grid polarizing plate 10 and is emitted from the infrared light transmitting portion 7c of the cover glass 7 to the outside of the vehicle instrument 1 for operation. Reach the face of person D.
　運転者ＤがメガネＧをかけていると、メガネＧによる強い反射光（正反射光）はＰ波のまま車両用計器１に戻り、カバーガラス７の透過部７ａ、位相差フィルム８及び表示パネル３の赤外光透過部３ａを透過してカメラ５に向かうが（ワイヤーグリッド偏光板１０を透過したＰ波は、偏光方向が位相差フィルム８の進相軸又は遅相軸と平行であるから、直線偏光のまま位相差フィルム８を通過する。）、ワイヤーグリッド偏光板９はＳ波のみを透過させてＰ波をカットするから、カメラ５に強い反射光は入射しない。 When the driver D wears the glasses G, the strongly reflected light (normally reflected light) by the glasses G returns to the vehicle instrument 1 as a P wave, and the transmission portion 7a of the cover glass 7, the retardation film 8 and the display panel. It passes through the infrared light transmitting portion 3a of 3 and heads toward the camera 5 (because the polarization direction of the P wave transmitted through the wire grid polarizing plate 10 is parallel to the phase-advancing axis or the slow-phase axis of the retardation film 8). , Passing through the retardation film 8 with linearly polarized light.) Since the wire grid polarizing plate 9 transmits only the S wave and cuts the P wave, strong reflected light is not incident on the camera 5.
　一方、メガネＧではなく運転者Ｄの目その他の顔の部分において拡散反射された反射光は、Ｐ波及びＳ波に分かれて車両用計器１に戻るから、Ｓ波がワイヤーグリッド偏光板９を透過してカメラ５で運転者Ｄの顔が撮像される。 On the other hand, the reflected light diffusely reflected by the driver D's eyes and other facial parts instead of the glasses G is divided into P waves and S waves and returned to the vehicle instrument 1, so that the S waves press the wire grid polarizing plate 9. The face of the driver D is imaged by the camera 5 through transmission.
　運転者Ｄの撮像画像は、図示を略す制御部に入力され、顔の動作等から運転者Ｄの状態が検知される。例えば、制御部は、運転者Ｄの目の位置から運転者Ｄがどこを見ている状態にあるのか、つまり、運転者Ｄの視点位置を検出し、その視点位置に合わせて表示パネル３の表示を制御することができるし、運転者Ｄが眠気を催している状態や脇見運転をしている状態であれば、音や表示、振動等により警告を発することもできる。 The captured image of the driver D is input to the control unit (not shown), and the state of the driver D is detected from the movement of the face and the like. For example, the control unit detects where the driver D is looking from the position of the eyes of the driver D, that is, the viewpoint position of the driver D, and the display panel 3 is adjusted to the viewpoint position. The display can be controlled, and if the driver D is drowsy or inattentive driving, a warning can be issued by sound, display, vibration, or the like.
　本実施の形態に係る車両用計器１は、車両に関する情報を表示する表示パネル３と、表示パネル３を視認可能な運転者Ｄに向けて赤外光を照射するＬＥＤ６と、赤外光により運転者Ｄを撮像するカメラ５とを備え、ＬＥＤ６の運転者Ｄの側にワイヤーグリッド偏光板１０が設けられるとともに、カメラ５の運転者Ｄの側にワイヤーグリッド偏光板９が設けられ、ワイヤーグリッド偏光板９の偏光方向とワイヤーグリッド偏光板１０の偏光方向とが直交するので、ＬＥＤ６から照射された赤外光が、ＬＥＤ６の正面側にあるワイヤーグリッド偏光板１０により直線偏光となり、運転者ＤのメガネＧ等で正反射されて強い反射光として戻ってきても、カメラ５の正面側にあるワイヤーグリッド偏光板９は、偏光方向がワイヤーグリッド偏光板１０の偏光方向と直交し、その強い反射光をカットする。一方、運転者Ｄで拡散反射された反射光は、その一部がワイヤーグリッド偏光板９を透過してカメラ５に入射するので、運転者Ｄの撮像が強い反射光により妨げられる事態を防止することができる。 The vehicle instrument 1 according to the present embodiment is operated by a display panel 3 for displaying information about the vehicle, an LED 6 for irradiating the display panel 3 with infrared light toward a visible driver D, and infrared light. A camera 5 for photographing the person D is provided, a wire grid polarizing plate 10 is provided on the side of the driver D of the LED 6, and a wire grid polarizing plate 9 is provided on the side of the driver D of the camera 5, and the wire grid polarizing plate is provided. Since the polarization direction of the plate 9 and the polarization direction of the wire grid polarizing plate 10 are orthogonal to each other, the infrared light emitted from the LED 6 is linearly polarized by the wire grid polarizing plate 10 on the front side of the LED 6, and the driver D's Even if the wire grid polarizing plate 9 on the front side of the camera 5 is positively reflected by the glasses G or the like and returned as strongly reflected light, the polarization direction of the wire grid polarizing plate 9 is orthogonal to the polarization direction of the wire grid polarizing plate 10, and the strongly reflected light thereof. To cut. On the other hand, a part of the reflected light diffusely reflected by the driver D passes through the wire grid polarizing plate 9 and is incident on the camera 5, so that the situation where the image pickup of the driver D is hindered by the strong reflected light is prevented. be able to.
　また、もしワイヤーグリッド偏光板９の偏光方向（及び、これに直交するワイヤーグリッド偏光板１０の偏光方向）が位相差フィルム８の進相軸又は遅相軸と斜めに交差する角度をなすと、ワイヤーグリッド偏光板９で偏光させた赤外光が位相差フィルム８を通過する際に円偏光に戻り、Ｐ波を運転者Ｄに照射してＳ波をカメラ５に入光することができなくなるが、本実施の形態では、位相差フィルム８の進相軸又は遅相軸が、ワイヤーグリッド偏光板９の偏光方向と平行であるので、ワイヤーグリッド偏光板及び位相差フィルムの性能を害することなく、両者を車両用計器１に同時に搭載することができる。  Further, if the polarization direction of the wire grid polarizing plate 9 (and the polarization direction of the wire grid polarizing plate 10 orthogonal to the polarization direction) forms an angle that diagonally intersects the phase-advancing axis or the slow-phase axis of the retardation film 8. When the infrared light polarized by the wire grid polarizing plate 9 passes through the retardation film 8, it returns to circularly polarized light, irradiates the driver D with the P wave, and the S wave cannot enter the camera 5. However, in the present embodiment, since the phase-advancing axis or the slow-phase axis of the retardation film 8 is parallel to the polarization direction of the wire grid polarizing plate 9, the performance of the wire grid polarizing plate and the retardation film is not impaired. , Both can be mounted on the vehicle instrument 1 at the same time. The
　さらに、カバーガラス７にアクリルやポリカーボネート等の押出板を用いると、押出板の製造工程で原料が延ばされるために偏光特性が生じ、押出板がワイヤーグリッド偏光板の効果を消失させてしまうことが考えられるが、本実施の形態では、カバーガラス７が、赤外光の偏光特性に影響しない無機ガラスやキャスト材からなるので、ワイヤーグリッド偏光板の性能を害することなくカバーガラスを設置することが可能となる。  Further, when an extruded plate such as acrylic or polycarbonate is used for the cover glass 7, the raw material is extended in the process of manufacturing the extruded plate, so that polarization characteristics are generated and the extruded plate loses the effect of the wire grid polarizing plate. However, in the present embodiment, since the cover glass 7 is made of an inorganic glass or a cast material that does not affect the polarization characteristics of infrared light, it is possible to install the cover glass without impairing the performance of the wire grid polarizing plate. It will be possible. The
　なお、本発明は、上述の実施形態及び図面によって限定されるものではなく、本発明の要旨を変更しない範囲で、適宜、実施形態及び図面に変更（構成要素の削除も含む。）を加えることが可能である。 The present invention is not limited to the above-described embodiments and drawings, and changes (including deletion of components) may be made to the embodiments and drawings as appropriate without changing the gist of the present invention. Is possible.
　例えば、上述した実施形態では、位相差フィルム８がＬＥＤ６の正面側には設けられておらず、カメラ５は表示パネル３の背面側に設けられているが、位相差フィルム８をＬＥＤ６の正面側に設けても、カメラ５を表示パネル３の背面側に設けなくてもよく、車両用表示装置の各構成要素の配置は、ワイヤーグリッド偏光板の配置が本発明の要旨に適っていれば、どのようなものであってもかまわない。また、上述した実施形態では、位相差フィルム８の進相軸が車両の幅方向で、位相差フィルム８の遅相軸が車両の高さ方向であったが、これとは逆に前記遅相軸を車両の幅方向とし、前記進相軸を車両の高さ方向としてもよい。 For example, in the above-described embodiment, the retardation film 8 is not provided on the front side of the LED 6, and the camera 5 is provided on the back side of the display panel 3, but the retardation film 8 is provided on the front side of the LED 6. The camera 5 may not be provided on the back side of the display panel 3, and the arrangement of each component of the vehicle display device is such that the arrangement of the wire grid polarizing plate is suitable for the gist of the present invention. It doesn't matter what it is. Further, in the above-described embodiment, the phase-advancing axis of the retardation film 8 is in the width direction of the vehicle, and the slow-phase axis of the retardation film 8 is in the height direction of the vehicle. The axis may be the width direction of the vehicle, and the phase advance axis may be the height direction of the vehicle.
１　　車両用計器（車両用表示装置） 
３　　表示パネル（表示手段、液晶表示パネル） 
５　　カメラ（撮像手段） 
６　　赤外光照射手段（ＬＥＤ） 
７　　カバーガラス（保護部材） 
８　　位相差フィルム（位相差板） 
９　　ワイヤーグリッド偏光板（第一のワイヤーグリッド偏光板） 
１０　ワイヤーグリッド偏光板（第二のワイヤーグリッド偏光板） 
Ｄ　　運転者（視認者）  1 Vehicle instrument (vehicle display device)
3 Display panel (display means, liquid crystal display panel)
5 Camera (imaging means)
6 Infrared light irradiation means (LED)
7 Cover glass (protective member)
8 Phase difference film (phase difference plate)
9 Wire grid polarizing plate (first wire grid polarizing plate)
10 Wire grid polarizing plate (second wire grid polarizing plate)
D Driver (visual person)

Claims (4)

  1. 　車両に関する情報を表示する表示手段と、 
    　前記表示手段を視認可能な視認者に向けて赤外光を照射する赤外光照射手段と、 
    　前記赤外光により前記視認者を撮像する撮像手段とを備え、 
    　前記撮像手段の前記視認者の側に第一のワイヤーグリッド偏光板が設けられるとともに前記赤外光照射手段の前記視認者の側に第二のワイヤーグリッド偏光板が設けられ、
    　前記第一のワイヤーグリッド偏光板の偏光方向と前記第二のワイヤーグリッド偏光板の偏光方向とが直交することを特徴とする車両用表示装置。     A display means for displaying information about the vehicle,
    Infrared light irradiation means for irradiating the display means with infrared light toward a visible viewer, and
    It is provided with an imaging means for imaging the viewer with the infrared light.
    A first wire grid polarizing plate is provided on the side of the viewer of the imaging means, and a second wire grid polarizing plate is provided on the side of the viewer of the infrared light irradiation means.
    A display device for a vehicle, characterized in that the polarization direction of the first wire grid polarizing plate and the polarization direction of the second wire grid polarizing plate are orthogonal to each other.
  2. 　前記表示手段は液晶表示パネルで、前記表示手段及び前記撮像手段の前記視認者の側に位相差板が設けられ、 
    　前記位相差板の進相軸又は遅相軸が、前記第一のワイヤーグリッド偏光板の偏光方向と平行であることを特徴とする請求項１に記載の車両用表示装置。     The display means is a liquid crystal display panel, and a phase difference plate is provided on the side of the display means and the viewer of the image pickup means.
    The vehicle display device according to claim 1, wherein the phase advance axis or the slow phase axis of the retardation plate is parallel to the polarization direction of the first wire grid polarizing plate.
  3. 　前記表示手段、前記赤外光照射手段及び前記撮像手段の前記視認者の側に、前記赤外光の偏光特性に影響しない材質からなる保護部材が設けられていることを特徴とする請求項１又は請求項２に記載の車両用表示装置。 Claim 1 is characterized in that a protective member made of a material that does not affect the polarization characteristics of the infrared light is provided on the side of the display means, the infrared light irradiation means, and the viewer of the image pickup means. Or the display device for a vehicle according to claim 2.
  4. 　前記保護部材が、無機ガラス又はキャスト材からなることを特徴とする請求項３に記載の車両用表示装置。  The vehicle display device according to claim 3, wherein the protective member is made of inorganic glass or a cast material. The
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011257610A (en) * 2010-06-09 2011-12-22 Hayashi Technical Kenkyusho:Kk On-vehicle display device
EP3193318A1 (en) * 2016-01-18 2017-07-19 Autoliv Development AB Driver monitoring system and driver monitoring method for a motor vehicle
WO2017175627A1 (en) * 2016-04-05 2017-10-12 林テレンプ株式会社 Display device and optical element
JP2018072219A (en) * 2016-10-31 2018-05-10 株式会社ファルテック Vehicle night monitoring device and vehicle exterior component
JP2019020991A (en) * 2017-07-14 2019-02-07 シャープ株式会社 Imaging device, authentication device, and imaging method
JP2020032825A (en) * 2018-08-29 2020-03-05 日本精機株式会社 Vehicle display device
JP2020036144A (en) * 2018-08-29 2020-03-05 日本精機株式会社 Occupant monitoring device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011257610A (en) * 2010-06-09 2011-12-22 Hayashi Technical Kenkyusho:Kk On-vehicle display device
EP3193318A1 (en) * 2016-01-18 2017-07-19 Autoliv Development AB Driver monitoring system and driver monitoring method for a motor vehicle
WO2017175627A1 (en) * 2016-04-05 2017-10-12 林テレンプ株式会社 Display device and optical element
JP2018072219A (en) * 2016-10-31 2018-05-10 株式会社ファルテック Vehicle night monitoring device and vehicle exterior component
JP2019020991A (en) * 2017-07-14 2019-02-07 シャープ株式会社 Imaging device, authentication device, and imaging method
JP2020032825A (en) * 2018-08-29 2020-03-05 日本精機株式会社 Vehicle display device
JP2020036144A (en) * 2018-08-29 2020-03-05 日本精機株式会社 Occupant monitoring device

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